#ifndef REGEX_H_62B23520_7C8E_11DE_8A39_0800200C9A66
#define REGEX_H_62B23520_7C8E_11DE_8A39_0800200C9A66

#if defined(_MSC_VER) ||                                            \
    (defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || \
     (__GNUC__ >= 4)) // GCC supports "pragma once" correctly since 3.4
#pragma once
#endif

#include <string>
#include <vector>

#include "yaml-cpp/dll.h"

namespace YAML {
class Stream;

enum REGEX_OP {
    REGEX_EMPTY,
    REGEX_MATCH,
    REGEX_RANGE,
    REGEX_OR,
    REGEX_AND,
    REGEX_NOT,
    REGEX_SEQ
};

// simplified regular expressions
// . Only straightforward matches (no repeated characters)
// . Only matches from start of string
class YAML_CPP_API RegEx {
public:
    RegEx();
    explicit RegEx(char ch);
    RegEx(char a, char z);
    RegEx(const std::string& str, REGEX_OP op = REGEX_SEQ);
    ~RegEx() = default;

    friend YAML_CPP_API RegEx operator!(const RegEx& ex);
    friend YAML_CPP_API RegEx operator|(const RegEx& ex1, const RegEx& ex2);
    friend YAML_CPP_API RegEx operator&(const RegEx& ex1, const RegEx& ex2);
    friend YAML_CPP_API RegEx operator+(const RegEx& ex1, const RegEx& ex2);

    bool Matches(char ch) const;
    bool Matches(const std::string& str) const;
    bool Matches(const Stream& in) const;
    template <typename Source>
    bool Matches(const Source& source) const;

    int Match(const std::string& str) const;
    int Match(const Stream& in) const;
    template <typename Source>
    int Match(const Source& source) const;

private:
    explicit RegEx(REGEX_OP op);

    template <typename Source>
    bool IsValidSource(const Source& source) const;
    template <typename Source>
    int MatchUnchecked(const Source& source) const;

    template <typename Source>
    int MatchOpEmpty(const Source& source) const;
    template <typename Source>
    int MatchOpMatch(const Source& source) const;
    template <typename Source>
    int MatchOpRange(const Source& source) const;
    template <typename Source>
    int MatchOpOr(const Source& source) const;
    template <typename Source>
    int MatchOpAnd(const Source& source) const;
    template <typename Source>
    int MatchOpNot(const Source& source) const;
    template <typename Source>
    int MatchOpSeq(const Source& source) const;

private:
    REGEX_OP m_op;
    char m_a{};
    char m_z{};
    std::vector<RegEx> m_params;
};
} // namespace YAML

#include "regeximpl.h"

#endif // REGEX_H_62B23520_7C8E_11DE_8A39_0800200C9A66
